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Goodwill - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Goodwill [Line Items]        
Goodwill impairment $ 8,288 $ 0 $ 8,288 $ 0